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  • UCC27714EVM-551: R3, R4, R8 value on daughter control board containing UCC28950

    Resolved
    Part Number: UCC27714EVM-551 Other Parts Discussed in Thread: UCC28950 , UCC28950EVM-442 , Hello, Both SLUA560C (fig. 7, Daughter Board Schematic) and SLUA560D (fig. 15-1, Daughter Board Schematic) show R3 = R4 = 30.1k, while R8 = 14k. However, actual values…
    • Resolved

  • UCC28950: UCC27714EVM-551: Efficiency jump earlier seen when SR MOSFETs turned ON has suddenly disappeared

    TI Thinks Resolved
    Part Number: UCC28950 Other Parts Discussed in Thread: UCC27714EVM-551 , Hello, We modified the UCC27714EVM-551 for 24V output by changing transformer turns ratio and other key components voltage ratings. The original deadtime delay settings on the eval…

  • UCC27714EVM-551: UCC28950 daughter card (HPA471B ?) CAD schematic files

    TI Thinks Resolved
    Part Number: UCC27714EVM-551 Other Parts Discussed in Thread: UCC28950 , Hello, I am looking for the UCC28950 daughter card (HPA471B ?) CAD schematic files. I only see a link to its Gerber files....but no schematics that I can readily import instead of…
    • Answered

  • UCC27714EVM-551: If UCC28950 disables the SR MOSFET drives in DCM mode, then how does output rectification happen?

    Resolved
    Part Number: UCC27714EVM-551 Other Parts Discussed in Thread: UCC28950 Per UCC28950 datasheet, when voltage at CS pin is lower than the threshold set by the user, UCC28950 disables the SR MOSFET drives....this I understand as meaning "DCM mode".…
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  • UCC27714EVM-551: UCC27714EVM-551 has failed

    TI Thinks Resolved
    Part Number: UCC27714EVM-551 Other Parts Discussed in Thread: UCC27714 Hi Team In the absence of strong power supply test drive signal, it was found that the drive signal of Q1 pipe was obviously blocked with other roads, about 2V smaller After the input…
    • Answered

  • UCC28950EVM-442: UCC27714EVM-551 choice of H-bridge switching frequency

    Resolved
    Part Number: UCC28950EVM-442 Other Parts Discussed in Thread: UCC28950 Hello, Switching frequency of H-bridge in these evaluation boards appears to be set to ~100kHz. 1) I am considering switching at a higher frequency (say 250kHz ~ 300kHz) to reduce magnetics…
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    • Answered

  • UCC27714EVM-551: Power On/Off Procedure

    Resolved
    Part Number: UCC27714EVM-551 Other Parts Discussed in Thread: UCC28950 , UCC27714 , UCC27524A Hello, The user's guide of the UCC27714EVM-551 says the following about the on procedure: 1. The EVM was not designed to startup from 0-V input voltage…
    • Resolved

  • UCC27714EVM-551: UCC27714 EVM application circuit question

    TI Thinks Resolved
    Part Number: UCC27714EVM-551 Hi Support team what is the function for D4 &D6 thanks a lot

  • UCC27714EVM-551: how to test cycle-by-cycle current limit

    Part Number: UCC27714EVM-551 Other Parts Discussed in Thread: UCC28950 , Hello, I've been working with the UCC27714EVM-551 under overload condition to test the cycle-by-cycle current limit and see how the UCC28950 manages this. I've tried to apply a…

  • UCC27714EVM-551: Massive peak current (primary side) under no load condition

    TI Thinks Resolved
    Part Number: UCC27714EVM-551 Other Parts Discussed in Thread: UCC28950 , Hello, I've been testing the UCC27714EVM-551 board, and under no-load condition I saw on the CS pin of the Power Board (not exactly the CS pin of the UCC28950, as there's a 1k-330pF…

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